Monday, September 28, 2026

Hidden Parameters in Oracle AI Database 26ai H.15 Backup / restore (57)

 

NameTypeValueAt default?LevelPDBRAC inst.FlagsDescription
_backup_align_write_ioBooleanTRUEyesSESSIONYYalign backup write I/Os
_backup_appliance_enabledBooleanFALSEyesSYSTEM imm.NYBackup Appliance Enabled
_backup_automatic_retryInteger10yesSESSIONYYautomatic retry on backup write errors
_backup_block0StringdefaultyesSYSTEM imm.NYbackup block0
_backup_bool_spare1BooleanFALSEyesSESSIONYYbackup bool spare1
_backup_bool_spare2BooleanFALSEyesSESSIONYYbackup bool spare2
_backup_bool_spare3BooleanFALSEyesSESSIONYYbackup bool spare3
_backup_bool_spare4BooleanFALSEyesSESSIONYYbackup bool spare4
_backup_compressBooleanFALSEyesSESSIONYYturn on backup compression always
_backup_compressed_align_write_ioBooleanTRUEyesSESSIONYYalign compressed backup write I/Os
_backup_disk_bufcntInteger0yesSESSIONYYnumber of buffers used for DISK channels
_backup_disk_bufszInteger0yesSESSIONYYsize of buffers used for DISK channels
_backup_disk_io_slavesInteger0yesSYSTEM def.NYBACKUP Disk I/O slaves
_backup_dynamic_buffersBooleanTRUEyesSESSIONYYdynamically compute backup/restore buffer sizes
_backup_encrypt_opt_modeInteger4294967294yesSESSIONYYspecifies encryption block optimization mode
_backup_file_bufcntInteger0yesSESSIONYYnumber of buffers used for file access
_backup_file_bufszInteger0yesSESSIONYYsize of buffers used for file access
_backup_int_spare1Integer4294967294yesSESSIONYYbackup int spare1
_backup_int_spare2Integer4294967294yesSESSIONYYbackup int spare2
_backup_int_spare3Integer4294967294yesSESSIONYYbackup int spare3
_backup_int_spare4Integer4294967294yesSESSIONYYbackup int spare4
_backup_interrupt_wait_timeInteger1000yesSESSIONYYspecifies interrupt wait time in centi seconds
_backup_io_pool_sizeInteger1048576yesSTATICNNmemory to reserve from the large pool
_backup_kgc_bz2_bufszInteger0yesSESSIONYYspecifies buffer size to be used by BZ2 compression
_backup_kgc_bz2_nitersInteger0yesSESSIONYYspecifies number of iterations done by BZ2 compression
_backup_kgc_bz2_typeInteger0yesSESSIONYYspecifies type used by BZ2 compression
_backup_kgc_bzip2_blksizInteger9yesSESSIONYYspecifies buffer size to be used by BZIP2 compression
_backup_kgc_lzo_bufszInteger262144yesSESSIONYYspecifies buffer size to be used by LZO compression
_backup_kgc_medium_schemeStringDEFAULTyesSESSIONYYspecifies medium compression scheme
_backup_kgc_schemeStringZLIByesSESSIONYYspecifies compression scheme
_backup_kgc_zlib_complevelInteger1yesSESSIONYYspecifies compression (performance) level for ZLIB compression
_backup_kgc_zlib_memlevelInteger8yesSESSIONYYspecifies memory level for ZLIB compression
_backup_kgc_zlib_windowbitsInteger15yesSESSIONYYspecifies window size for ZLIB compression
_backup_kgc_zstd_bufszInteger262144yesSESSIONYYspecifies buffer size to be used by ZSTD compression
_backup_kgc_zstd_complevelInteger3yesSESSIONYYspecifies compression (performance) level for ZSTD compression
_backup_kgc_zstd_high_complevelInteger14yesSESSIONYYspecifies compression (performance) level for ZSTD compression
_backup_ksfq_bufcntInteger0yesSESSIONYYnumber of buffers used for backup/restore
_backup_ksfq_bufmem_maxBig integer268435456yesSESSIONYYmaximum amount of memory (in bytes) used for buffers for backup/restore
_backup_ksfq_bufszInteger0yesSESSIONYYsize of buffers used for backup/restore
_backup_max_gap_sizeInteger4294967294yesSESSIONYYlargest gap in an incremental/optimized backup buffer, in bytes
_backup_max_wallet_sessionInteger50yesSESSIONYYspecifies maximum wallet session for backup
_backup_seq_bufcntInteger0yesSESSIONYYnumber of buffers used for non-DISK channels
_backup_seq_bufszInteger0yesSESSIONYYsize of buffers used for non-DISK channels
_backup_text_spare1StringyesSESSIONYYbackup text spare1
_backup_text_spare2StringyesSESSIONYYbackup text spare2
_backup_text_spare3StringyesSESSIONYYbackup text spare3
_backup_text_spare4StringyesSESSIONYYbackup text spare4
_restore_block0StringonyesSYSTEM imm.NYrestore block0
_restore_create_directoryBooleanTRUEyesSYSTEM imm.NYautomatically create directory during restore
_restore_delayed_writeBooleanFALSEyesSESSIONYYrestore datafiles with delayed write option
_restore_maxopenfilesInteger8yesSESSIONYYrestore assumption for maxopenfiles
_restore_spfileStringyesSTATICNNrestore spfile to this location
_rman_client_wait_timeInteger10yesSESSIONYYmaximum time to wait for the client
_rman_io_priorityInteger3yesSYSTEM imm.NYpriority at which rman backup i/o's are done
_rman_restore_db_master_key_sync_sourceStringCONTROL_FILEyesSYSTEM imm.YYRMAN restore DB master key sync source
_rman_roundrobin_placementIntegeryesSYSTEM imm.NYNuma round robin placement for RMAN procs
_rman_space_bitmap_blocksInteger1yesSESSIONYYcontrol backup and restore of space bitmap blocks

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